Votty and Bowydd Slate Quarries Company, Limited,
Votty and Bowydd Slate Quarries Company, Limited,
Ffestiniog and Blaenau Railway,
Ffestiniog and Blaenau Railway,
Porthmadog, Beddgelert and South Snowdon Railway,
Porthmadog, Beddgelert and South Snowdon Railway,
Oakeley Slate Quarries Company, Limited, Blaenau Ffestiniog,
Oakeley Slate Quarries Company, Limited, Blaenau Ffestiniog,
Maen Offeren Slate Quarry Company Limited,
Maen Offeren Slate Quarry Company Limited,
Whitland Abbey Gilfach Quarries,
Whitland Abbey Gilfach Quarries,
Moelpenamnan quarry,
Moelpenamnan quarry,
Wrysgan Slate Quarry Co. Ltd,
Wrysgan Slate Quarry Co. Ltd,
Bugail Slate Company Limited,
Bugail Slate Company Limited,
Precelly Green and Rustic Slate Company Limited, co. Pemb.,
Precelly Green and Rustic Slate Company Limited, co. Pemb.,
Diphwys Slate Quarry Company Limited,
Diphwys Slate Quarry Company Limited,
Tyrch Quarry,
Tyrch Quarry,
